What happens to what you type
Nothing leaves your device. Every calculation runs in your browser. There are no accounts, no cookies and no tracking.
- Saved inputs. Your numbers and tax profile are kept in your browser’s local storage so they’re there next time. They stay on this device and in this browser. Clearing your browser’s site data removes them.
- Share links. “Copy share link” packs a page’s inputs, and your tax profile, into the part of the link after the
#. Browsers never send that part to a server, so the numbers travel only with the link. Anyone you give the link to can see them, so share it like you’d share the numbers themselves. - Fonts. Pages load fonts from Google Fonts, which sees a normal web request from your browser, not anything you enter. Everything else, including the calculation engine, is served from this site.
Where the numbers come from
- Federal tax brackets and standard deductions are for tax year 2026, from IRS Revenue Procedure 2025-32.
- Treasury yields are the Treasury’s daily par yield curve, updated each business-day evening.
- State tax rates start at each state’s approximate top rate. Edit them to your own bracket.
Not advice
These are estimates to help you think a decision through. They aren’t financial, tax or legal advice, and they simplify real tax rules. Check anything important with a professional or your own tax return.